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Apache HTTP Server Version 1.3

Module mod_browser

This module is contained in the mod_browser.c
file, and is compiled in by default. It provides for setting
environment variables based on the browser. This module is part
of Apache 1.2.* only. From Apache 1.3 onwards mod_setenvif provides the
functionality of this module.

Summary

This module allows you to set environment variables based on
the name of the browser accessing your document, based on the
User-Agent header field. This is especially useful
when combined with a conditional HTML language such as XSSI or PHP, and can provide for
simple browser-based negotiation of HTML features.

Directives

The BrowserMatch directive defines environment variables
based on the User-Agent header. The first argument should be a
POSIX.2 extended regular expression (similar to an egrep-style
regex). The rest of the arguments give names of variables to
set. These take the form of either "varname",
"!varname" or "varname=value". In the
first form, the value will be set to "1". The second will
remove the given variable if already defined, and the third
will set the variable to the value given by value.
If a User-Agent string matches more than one entry, they will
be merged. Entries are processed in the order they appear, and
later entries can override earlier ones.